Earth Day!!

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Across
  1. 2. I help you, animals and plants breath and grow
  2. 4. I'm the reason behind everything that functions
  3. 7. We're living things
  4. 9. I'm a beauty that always surrounds you
  5. 10. I help save
  6. 12. When air gets dirty, we replace it with fresh air
  7. 13. I help people use again
  8. 15. Life begins and ends in me
  9. 16. I'm free of anything artificial
  10. 17. I make a recyclable into another product again
  11. 18. I am newborn and will one day become a tree
Down
  1. 1. Without me, earth would be 75% less of what it is now
  2. 3. I lessen and save the environment
  3. 5. I bring the elements of nature, fire, water and air together
  4. 6. I am the first step for reaping fruits of nature
  5. 7. I am an equilibrium
  6. 8. I have no limit, everyone claims they can reach me
  7. 10. Earth would be a garbage dump if it weren't for me
  8. 11. I'm the study of the environment
  9. 14. My shine helps keep all living things on earth alive